Unable to completely install Itunes

I have attached a screenshot image of the error I got. Please see the picture below:

Error writing to file: C:Program FilesCommon FilesAppleMobile Device Supportcom.apple.IE.client.resourcesEnglish.IprojLocali zable.strings. Verify that you have access to that directory. |
I got this error after attempting to install the new version of iTunes. However, I am successful with Quicktime side but unable to completely install the whole software . Do you have any idea what this error message is all about? And also, can you advise me on how to fix this problem? Thank you
